Canon 1000 Service Manual page 139

The toner density is measured by the SALT sensor as shown in Figure 3-516. When single copies are
made, measurements are taken after each copying run; during continuous copying, measurements are
taken when all copies have been made. However, if the copy count is set to '100' or higher, measurements
are taken after each 100 copies have been made.
Making 4 copies
Making 210 copies
Density
measurement
for SALT
The SALT sensor measures the density of toner, and computations are made to find out whether the
current toner density is higher or lower in comparison with the ideal density. The results of computations are
used to correct the toner supply amounts for the upcoming copying operations.
Start key
ON
COPY
COPYRIGHT © 2001 CANON INC.
1st 2nd 3rd
1st
100th 101st
LSTR STBY
Toner density
measurement
for SALT
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
4th
200th
199th
Figure 3-516
Start key
ON
COPY
Figure 3-516A
3. OPERATION AND TIMING
201st 210th
LSTR STBY
3-95